Saw this last night. Not going to post any spoilers, but wow it is spectacular.

I'm not a big fan of 3D in general, can't say it adds much to most films and certainly there are a fair number of scenes in Avatar where I couldn't care less that it was in 3D, but once the action moves to Pandora boy does that change. This is the film the new 3D was invented for.

I can only say it was awesome. Certainly the best movie I've seen in 3D and definitely worth the extra cash to see the 3D version. The battle at the end is just mind-blowing.